### Home Classes Methods

### In Files

- lib/taskjuggler/daemon/Daemon.rb

### Parent

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### Methods

- ::new
- #start
- #stop

### Included Modules

- TaskJuggler::MessageHandler

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No matching classes.

# TaskJuggler::Daemon

This class provides the basic functionality to turn the current process into a background process (daemon). To use it, derive you main class from this class and call the start() method.

### Attributes

daemonize[RW]
pidFile[RW]

### Public Class Methods

new() click to toggle source

    # File lib/taskjuggler/daemon/Daemon.rb, line 25
    def initialize
      # You can set this flag to false to prevent the program from
      # disconnecting from the current terminal. This is useful for debugging
      # purposes.
      @daemonize = true
      # Save the PID of the running daemon as number into this file.
      @pidFile = nil
    end

### Public Instance Methods

start() click to toggle source

Call this method to turn the process into a background process.

    # File lib/taskjuggler/daemon/Daemon.rb, line 35
    def start
      return 0 unless @daemonize

      # Fork and have the parent exit
      if (pid = fork) == -1
        fatal('first_fork_failed', 'First fork failed')
      elsif !pid.nil?
        # This is the parent. We can exit now.
        debug('', "Forked a child process with PID #{pid}")
        exit! 0
      end

      # Create a new session
      Process.setsid
      # Fork again to make sure we lose the controlling terminal
      if (pid = fork) == -1
        fatal('second_fork_failed', 'Second fork failed')
      elsif !pid.nil?
        # This is the parent. We can exit now.
        debug('', "Forked a child process with PID #{pid}")
        exit! 0
      end

      @pid = Process.pid

      writePidFile

      # Change current working directory to the file system root
      Dir.chdir '/'
      # Make sure we can create files with any permission
      File.umask 0

      # We no longer have a controlling terminal, so these are useless.
      $stdin.reopen('/dev/null')
      $stdout.reopen('/dev/null', 'a')
      $stderr.reopen($stdout)

      info('daemon_pid',
           "The process is running as daemon now with PID #{@pid}")

      0
    end

stop() click to toggle source

This method may provide some cleanup functionality in the future. You better call it before you exit.

    # File lib/taskjuggler/daemon/Daemon.rb, line 80
    def stop
      if @pidFile
        begin
          File.delete(@pidFile)
        rescue
          warning('cannot_delete_pidfile',
                  "Cannote delete the PID file (#{@pidFile}): #{$!}")
        end
        info('daemon_deleted_pidfile', "PID file #{@pidFile} deleted")
      end
    end

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